Season 1
7.6
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Secrets of the Underground
A quest to uncover a hidden escape passage rumored to have been utilized by Al Capone. Additionally, an investigation into the origins of mysterious earthen mounds found in Washington state.
TV Status: Returning Series
Duration: 1h
Release: 2017
IMDb: 6.4
TMDb: 4.3
Country: United States of America
Networks: Science
